Fuentes García, Cristian Ricardo and Cortez Nochez, German Roberto and Henríquez Durán, Roni Leonardo (2017) The most common patterns of fossilization on students of the Advanced English ll courses of the bachelor of arts in english language teaching and the Bachelor of Arts in Modern Languages with specialization in French and English at the Foreign Language Department, University of El Salvador, semester I-2017. Bachelor thesis, Universidad de El Salvador.